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what happens if you change the order of the add-ins when you add hi there looks like somebody left their toys in the sandbox hmm cars and buckets but how many did they leave hey why don't we find an answer but first let's find out how many buckets and how many cars there are click the red bucket to begin okay there are six buckets and seven cards or is it seven cars and six buckets hmm does it matter which number comes first let's go find out more about this then we'll find the answer George sees six blue birds and nine red birds how many birds does he see you can use blue and red connecting cubes to model the problem since George sees six blue birds let's use six blue connecting cubes to show them click the empty cells to place the six connecting cubes now show six and the number sentence how many Redbirds does George see nine so let's use nine red connecting cubes to show the number of red birds next show nine in the number sentence so how many cubes are there at all click the last part of the number sentence to see if you're right 15 there are 15 cubes and all okay go ahead and change the order of the audience by clicking the cube train how many red pubes are there now nine how many blue cubes are there six so how many cubes are there at all there are 15 take a look at both cube trains together how are they alike and how are they different the first cube train shows six blue cubes and nine red cubes the second cube train shows nine red cubes in six blue cubes both cube trains show 15 cubes how are these addition sentences alike indifferent well they both have six nine and fifteen six and nine are in a different order this means changing the order of the add-ins doesn't change the sum so how many birds does George see he sees 15 Birds try writing to math bags to show the number of birds start by finding the addends in this first edition problem four and five what's the sum of four and five drag the correct number to the first addition problem great job the sum of four and five is nine what other fact can you write using the same add-ins this time drag the numbers into the second addition problem click check when you're done excellent if you change the order of add-ins you see five plus four is equal to nine so why is the Sun the same for four plus five and four five plus four this sum is the same because you're adding the same two add-ins now let's practice with the personal math trainer